Futurama Hidden Jokes and Secrets

Pilot - Futurama Hidden Jokes and Secrets

Pilot

Nibbler's shadow can be seen. It is revealed in Season 5 that Nibbler pushed Fry into the freezer
Pilot - Futurama Hidden Jokes and Secrets

Pilot

Alienese
"Venusians go home"
Pilot - Futurama Hidden Jokes and Secrets

Pilot

President Grover Cleveland has two heads in the head museum because he was the only president to serve two non-consecutive terms
Season 1 Episode 2 - Futurama Hidden Jokes and Secrets

Season 1 Episode 2

Alienese
"Tasty human burgers"
Season 1 Episode 3 - Futurama Hidden Jokes and Secrets

Season 1 Episode 3

Bender's room number 00100100 is $ in ASCII
Season 1 Episode 7 - Futurama Hidden Jokes and Secrets

Season 1 Episode 7

The Number Nine shirt character is seen several times before the movie "Into the Wild Green Yonder" after season 5
Season 1 Episode 9 - Futurama Hidden Jokes and Secrets

Season 1 Episode 9

Bender's Friend, a speaker, used to work at jack in the Box. Get it. Because he is a box and you jack into it.
...
I thought it was funny.
Season 2 Episode 1 - Futurama Hidden Jokes and Secrets

Season 2 Episode 1

Bender finding out that a Diamond bracelet from his lover is a fake
Season 3 Episode 5 - Futurama Hidden Jokes and Secrets

Season 3 Episode 5

Bender throwing it away in a flashback to those events in the next season
Season 2 Episode 4 - Futurama Hidden Jokes and Secrets

Season 2 Episode 4

When we see inside Bender's head, the number 6502. The 6502 was an 8-bit microprocessor created by MOS Technology in 1975.
Season 2 Episode 5 - Futurama Hidden Jokes and Secrets

Season 2 Episode 5

Leela's parents seen in the sewers before their characters are actually introduced.
Season 2 Episode 7 - Futurama Hidden Jokes and Secrets

Season 2 Episode 7

This sign says "Of" twice
Season 2 Episode 11 - Futurama Hidden Jokes and Secrets

Season 2 Episode 11

Discrete: Individually separate and distinct
Discreet: Careful and circumspect in one's speech or actions
Season 3 Episode 2 - Futurama Hidden Jokes and Secrets

Season 3 Episode 2

1010011010 is 666 in Binary
Season 6 Episode 1 - Futurama Hidden Jokes and Secrets

Season 6 Episode 1

In the opening credits a new character, "Zylex" is introduced, but never actually shows up.
Season 6 Episode 1 - Futurama Hidden Jokes and Secrets

Season 6 Episode 1

Until...
later in that episode when he can be seen at Elzar's for a second.
Season 6 Episode 1 - Futurama Hidden Jokes and Secrets

Season 6 Episode 1

Fry's fossilised dog can be seen several times in the background at Planet Express.
Season 6 Episode 1 - Futurama Hidden Jokes and Secrets

Season 6 Episode 1

The God that Bender meets in "Goodfellas" is the same god as seen in "Bender's Big Score." Consistency.
Season 6 Episode 1 - Futurama Hidden Jokes and Secrets

Season 6 Episode 1

Spoiler for "Bender's Big Score."
Lar's pen is the same as Fry's pen. Because they are the same person.
Season 5 Episode 10 - Futurama Hidden Jokes and Secrets

Season 5 Episode 10

1729 is a recurring number in Futurama. It is the smallest number expressible as the sum of two cubes in two different ways
Season 7 Episode 10 - Futurama Hidden Jokes and Secrets

Season 7 Episode 10

The "Futurama Theorem" was a theorem created and proved by writer Ken Keeler. It is the first theorem to be created for the sole purpose of TV
Season 7 Episode 1 - Futurama Hidden Jokes and Secrets

Season 7 Episode 1

(1*1) * (2) * (3*3*3) = 54
In reference to Studio 54
Season 7 Episode 2 - Futurama Hidden Jokes and Secrets

Season 7 Episode 2

Staying consistent with "Urectum"
Season 7 Episode 7 - Futurama Hidden Jokes and Secrets

Season 7 Episode 7

Leela visible out of the Time Machine window as foreshadowing in "The Late Philip J. Fry"
Season 8 Episode 6 - Futurama Hidden Jokes and Secrets

Season 8 Episode 6

The Robot Devil reading "Life In Hell," another comic by Matt Groening
Season 9 Episode 6 - Futurama Hidden Jokes and Secrets

Season 9 Episode 6

Towards the beginning of this episode, the Professor smokes a carrot.
Season 9 Episode 6 - Futurama Hidden Jokes and Secrets

Season 9 Episode 6

Well, later in the episode Bender can be seen smoking a carrot.
Season 9 Episode 9 - Futurama Hidden Jokes and Secrets

Season 9 Episode 9

10011101 = 157, the largest known number with a square that is an anagram to the square of the next integer (158).
Edit: So apparently this isn't correct. /u/SKRules over on the Futurama Subreddit proved it false. https://www.reddit.com/r/math/comments/3gqqe5/debunking_a_minor_mathematical_myth/
ALL GLORY TO THE HYPNOTOAD - Futurama Hidden Jokes and Secrets

ALL GLORY TO THE HYPNOTOAD

Thanks for reading